/*
* Copyright (c) 2004 Darren Tucker.
*
* Based originally on asprintf.c from OpenBSD:
* Copyright (c) 1997 Todd C. Miller <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include "includes.h"

#ifndef HAVE_VASPRINTF

#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>

#ifndef VA_COPY
# ifdef HAVE_VA_COPY
#  define VA_COPY(dest, src) va_copy(dest, src)
# else
#  ifdef HAVE___VA_COPY
#   define VA_COPY(dest, src) __va_copy(dest, src)
#  else
#   define VA_COPY(dest, src) (dest) = (src)
#  endif
# endif
#endif

#define INIT_SZ 128

int
vasprintf(char **str, const char *fmt, va_list ap)
{
       int ret = -1;
       va_list ap2;
       char *string, *newstr;
       size_t len;

       VA_COPY(ap2, ap);
       if ((string = malloc(INIT_SZ)) == NULL)
               goto fail;

       ret = vsnprintf(string, INIT_SZ, fmt, ap2);
       if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
               *str = string;
       } else if (ret == INT_MAX || ret < 0) { /* Bad length */
               free(string);
               goto fail;
       } else {        /* bigger than initial, realloc allowing for nul */
               len = (size_t)ret + 1;
               if ((newstr = realloc(string, len)) == NULL) {
                       free(string);
                       goto fail;
               } else {
                       va_end(ap2);
                       VA_COPY(ap2, ap);
                       ret = vsnprintf(newstr, len, fmt, ap2);
                       if (ret >= 0 && (size_t)ret < len) {
                               *str = newstr;
                       } else { /* failed with realloc'ed string, give up */
                               free(newstr);
                               goto fail;
                       }
               }
       }
       va_end(ap2);
       return (ret);

fail:
       *str = NULL;
       errno = ENOMEM;
       va_end(ap2);
       return (-1);
}
#endif

#ifndef HAVE_ASPRINTF
int asprintf(char **str, const char *fmt, ...)
{
       va_list ap;
       int ret;

       *str = NULL;
       va_start(ap, fmt);
       ret = vasprintf(str, fmt, ap);
       va_end(ap);

       return ret;
}
#endif